Western Digital is trading 5.15% up at $471.23, with the advance appearing tied to renewed AI optimism, strong semiconductor export data, and tighter memory supply.
- Extends its September 21, 2026 close of $448.17.
- No new company-specific announcement or analyst action clearly explains the September 22 move.
- The memory-chip sector rose 3.04% during the regular session, while broader technology-market strength provided additional support.